Air-cooling device for engines



Nov. 3, 1925'.

W. TR EWHELLA 7 AIR COOLING DEVICE FOR ENGINES Filed June 5, 1922Patented Nov. 3, 1925.

-"'..- EE' AT' g aIR-co'omne Davies 3 ENGINES",

Application filed June 5,

To all whom it may concern:

Be it known that I, WVILLIAM TREWHELLA, a subject of the King of GreatBritain, residing at Trentham, in the State of Victoria, Commonwealth ofAustralia, have invented certain new and useful Improvements inAir-Cooling Devices for Engines, of which the following is aspecification.

The present invention refersto air cooled internal combustion engines inwhich the exterior surface of the cylinders is increased by theprovisionof a plurality of circumferentially or longitudinally arrangedfins o-r ribs exposed to the atmosphere. These fins or ribs being equispaced in practice, provide usually a series of parallel channels orpassages which according to the present invention are utilized with aplurality of separate air ducts or flues to ensure constant passage ofatmospheric air between the fins and resultant intimate air contact withthe whole of the surfaces.

Briefly stated the invention consists of a plurality of open sided airflues fitted with their open sides in communication with the spacesbetween the fins of the cylinder and with the edges of the plates whichform the sides of said flues across the edges of the fins.

The air is induced between the fins into the flues by natural or forceddraft of suction or through the flues into the passages between thefins, with the result that cold air impinges on the'cylinder wall andall the fins thereon simultaneously and is evacuated quickly beforebecoming materially heated.

In the accompanying drawings,

Fig. 1 is a side elevation partly in section of a four cylinder engine,embodying my invention;

Fig. 2 is a plan of parts of the same,

Fig. 3 is a section on line 3-3 of Fig. 1.

The invention is shown applied to a four cylinder motor car engine, theflues 2 are independent and are arranged on opposite sides of thecylinders C, the flues on-one side being central of the cylinders andthe flues on the other side being arranged central between thecylinders.

As shown in Fig. 2 the side walls of the flues on one side of thecylinders are in alinement with the side walls of the flues on theopposite side of the cylinders. These flues form vertical channels 4which extend longitudinally of the cylinders, the channels on one sideof the cylinders being opposite the 1922. Serial No. 565,871.

flues on the other side of the cylinders. This staggered arrangement ofthe flues and channels causes the air to be brought into contact withthe entire circumference of each cylinder.

The flues are open at the bottom so that air entering between the fluespasses through the passage between the fins into the flues and isdischarged through the open bottoms thereof.

All of the cylinders and flues are enclosed {2y a casing 1 which forms amain air cham- The velocity of the air flow may be increased by a fan l5driven by the crank shaft 16 and the fan may be rotated in eitherdirection according to whether the air is to pass in the directionindicated by the arrows or in the reverse directions.

It will be readily appreciated from the foregoing that by means of thepresent invention the open channels now provided will be divided up intoa large number of air ducts of short length each of which will receive aseparate draught from the atmosphere so that the entire exterior surfaceof the cylinder will be more or less equally subjected to the aircooling effect.

I claim- 1. In a cooling device for engines, the combination with anengine comprising a plurality of cylinders mounted'in parallel alinementhaving horizontal cooling fins thereon, of a plurality of air flues onone side of the engine arranged centrally of the cylinders, and aplurality of air flues on the opposite side of the engine arrangedcentrally between the cylinders, each flue being open at the bottom andhaving an open side, the longitudinal edges of the sides extendingacross-the fins, said flues forming vertical channels extendinglongitudinally of the cylinders, whereby the entire interior space ofthe flues communicate with the open spaces between the fins of thecylinders.

2. In a cooling device for engines, the combination with an enginecomprising a plurality of cylinders mounted in parallel alinement havinghorizontal coolin fins thereon, of a casing enclosing the cylindersforming a main air chamber, a plurality of air flues on one side of theengine arranged centrally of the cylinders, and a plurality of separateair flues on the opposite side of the engine arranged centrally betweenthe cylinders, each flue being open at the hot tom having v4m open.-side--extending longitudinal channels and passages between acrossithe"ifin's, said flues ifor-ming yertical "the fins and connects theToutside air air channels extending longitudinallyqf the through theopening in the bottom, and 10 cylinders, the channelson one side of themeans for forcing air through the main air cylinders beingnppcsite thelines on' "the chamber md Hues; 1

opposite side of the cylinders, whereby the Dated thisntwentieth day ofApril, 1922. interior of the fiues communicates with the 'WILLIAMTREWHELLA.

